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BUGFIX: Fix name-based way fragmentation in transportation_name (#1295)

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I discovered this bug while investigating issues with the updates process related to #1190 #1292, and #814.

The `transportation_name` layer produces slightly different `tags` hstore values in the `osm_transportation_name_linestring` table during the initial import versus when running an update.  As currently written, the import code produces null-value keys in the `tags` column, while the update code suppresses them.  This PR removes that difference and makes the import code use same method that is currently used in the update code.

With a test case I've written, the import code produces a tags hstore that looks like this:
`"name"=>"OpenMapTiles Secondary 2", "name:de"=>NULL, "name:en"=>NULL, "name_int"=>"OpenMapTiles Secondary 2", "name:latin"=>"OpenMapTiles Secondary 2"`

...while the update code produces a tags hstore that looks like this:

`"name"=>"OpenMapTiles Secondary 2", "name_int"=>"OpenMapTiles Secondary 2", "name:latin"=>"OpenMapTiles Secondary 2"`

Note the missing NULL values.

This bug causes a small amount of space wastage after an update is run, because the update matching code detects the `tags` value as different, resulting in a duplicate copy of the tags value if that row is updated.  This causes duplicate objects and breaks GROUP BY clauses that expect to group same-tagged features together.  I've tested this by inspection of a generated mbtiles, database spot checks, and the unit test code included in this PR.
This commit is contained in:
Brian Sperlongano
2021-11-25 04:45:11 -05:00
committed by GitHub
parent 0cff3449b5
commit ec74480414
9 changed files with 159 additions and 154 deletions
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9
tests/test-post-update.sql
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@@ -48,7 +48,14 @@ BEGIN
INSERT INTO omt_test_failures VALUES(400, 'update', 'osm_border_linestring city count expected 2, got ' || cnt);
END IF;
-- Test 500: Verify tags changed
-- Test 500: Highways
-- Same-named road previous split into 3 parts, now merged because the middle segment had toll=yes removed
SELECT COUNT(*) INTO cnt FROM osm_transportation_name_linestring WHERE tags->'name' = 'OpenMapTiles Secondary 3';
IF cnt <> 1 THEN
INSERT INTO omt_test_failures VALUES(500, 'update', 'osm_transportation_linestring unsplit road count expected 1, got ' || cnt);
END IF;
-- Verify tags changed
SELECT COUNT(*) INTO cnt FROM osm_transportation_merge_linestring_gen_z9
WHERE is_tunnel = TRUE
AND is_bridge = FALSE